#!/usr/bin/env python3

# Copyright (c) 2020-2021 Fpemud <fpemud@sina.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

import os


def get_os_language(game_spec):
    if "LC_ALL" in os.environ:
        lang = os.environ["LC_ALL"]
    elif "LANG" in os.environ:
        lang = os.environ["LANG"]
    elif "LC_LANG" in os.environ:
        lang = os.environ["LC_LANG"]
    else:
        lang = None

    if lang is not None:
        lang = lang.split(".")[0]        # en_US.utf8 -> en_US

    if lang is None or lang not in game_spec.languages:
        return game_spec.default_language
    else:
        return lang
